Longman Dictionary of Contemporary English homepage

firewall

 noun
     
Related topics: Computers
fire‧wall [countable]
1 a special wall that prevents fires from spreading to other parts of a building
2TD a system that protects a computer network from being used or looked at by people who do not have permission to do so
3 a system that is used by large financial or law companies to stop secret information from being passed from one department to another
Definition from the Longman Dictionary of Contemporary English
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